Free website tools

DNS Lookup

Look up A, AAAA, MX, NS, and TXT records for any domain - free, instant, no signup.

SSL Certificate Checker

Check any domain's SSL certificate validity, expiry date, issuer, and TLS version - free, instant.

Security Headers Checker

Check which HTTP security headers (CSP, HSTS, X-Frame-Options...) a website sends - free, instant.

DMARC & SPF Checker

Check if a domain has DMARC and SPF email authentication configured - free, instant.

WHOIS Lookup

Look up domain registration details: registrar, creation date, and expiry date - free, instant.

HTTPS Redirect Checker

Check if a domain properly redirects http:// to https:// - free, instant.

DNSBL / Spam Blacklist Checker

Check if a domain's IP is listed on major email spam blocklists (Spamhaus, SpamCop, SORBS) - free, instant.

Sitemap.xml Validator

Check if a domain's sitemap.xml is valid and how many URLs it lists - free, instant.